Electric low-speed unit



Dec. 17, 1929. o. CULLMAN ,739,826

ELECTRIC Low SPEED UNIT File Jan. 21, 1928 2 shons-sheet 1' 'na E W//fl//l////l/ &\\\\\\\\\\\\\\\\\ Dec. 17, 1929. o. CULLMAN ELECTRIG LOW SPEEDUNIT Filed Jan. 21, 1928 2 Sheets-Sheet 2 Patented Dec. 17, 1929 i fl om'ro cUL MAn, on CI-IICAGO, ILLINOIS ELECTBI C LOW-SPEEI) UNIT Application filed January '21, 1928. Serial Ne. 248349.

. This invention relates to a device to reduce or step down the high speed of electric motors to a speed adapted to run a determined machine, or for special purposes. j

Among the objects of the inventionis to obtain an eficent, durable and compact low speed unit which can be placed on and secured to any suitable substantially horizontal ,surface, as a floor, a metal plate, or on a platform. An additional object is to obtain an electric low speed unit adapted to be associated with an electric motor in such manner as to permit adjustment between the unit and the motor. A further object is to obtain an electric low speed unit in which all the gears sprockets, chains and bearings will be automatically -oiled, so long as a determined quantity of oil is contained in the housing of the device, and at the same time no oil will be lost or conveyed outside said housing. A still further object is to obtain an electric low speed unit in which the housing of the reducing means will be rigidly Secured to the base of the motor supporting member to permit the securing of the entire Construction on other than a horizontal table, without derangement of the relative position of the housing of the reducing means and the motor supporting member.

I have llustrated an electric low speed unit embodying this invention in the drawings referred to, in which Fig. 1 is an end elevation of a devce embodying the invention. Fig. 2 is a horizontal section of the device embodying the invention, taken on line 2-2 of Fig. 1, viewed as indicated by arrows. And Fig. 3 is a vertical section of said device, taken on line 3-3 of Fig. l, viewed as indicated by arrows, showing in side elevation an electric motor and in vertical section the base on which said motor is mounted.

A reference character applied to indicate a given part indicates said part throughout the several figures of the drawings wherever the to said housing. 3 represent lugs on housing l, and 4 bolts to secure cap 2 in place on the housing. 5 housing 1, adjacent to the lower end thereof, 6 represents .the base on which the electric motor driving the speed reducing mechanism isadjustably mounted. 6? representsa horirepresent lugs on one side 'of housing 1 and 1 1 apertures in said feet. 12 a represent feet on base 6, which are also provided with apertures. Lag screws or bolts are designed to be extended through apertures ll and the corresponding apertures in 'feet 12, tosecure the device in place. 13 represent bolts which eXtend through screw threaded apertures in table (S 13 represent bolts. i l represents a s'pacingplate. l c represents the base of elec'trc `motor 15. Bolts 13 extend through base 14?, plate 14:,and into screw threaded holes in the bolts 13. 16 represent heads of bolts 13 and 1.7 set nuts onsaid bolts. Vertical adjust-ment of motor is obtained by means of bolts 13 and is maintained by set nuts 17. l9 represents a collar which is forced on shaft 18, or made integral therewithg I have heretofore made collar 19 separate from.

said shaft and forced it thereon. 20 represents a cap which is Secured on one side of housing 1, as by bolts 21. 22 .represents an oil chamber or space in cap 20, and 23, '24, respectively, represent apertures through said cap through which shaft 18 extends. The aperture 23 is of larger diameter than isshaft 1 8, and aperture 24: is of larger diameter than is collar 19. 25 represents a duct in cap, 20, which communicates with space or chamber 22, and with housing l, todrain said .spaceior chamber of any oil contained therein, anddis charge it into the housing. '26, '27, respec::

tively, represent journal bearings mounted n the sides of housing 1. %represents a shaft which is rotatably mounted in bearings26, 27. 29, Fig. 1, represents a set screw by means of which the journal hearing 26 is maintained in an adjusted position. A similar set screw, not shown, is used to maintain bearing 27 in an adjusted position. 30, 31, respectively rep.- resent a cap which is secured in the aperturc in the side of housing 1 in which the journal bearngs 26, 27 are mounted, to prevent oil contained in the housing from leaking or flowing therefrom. 32 represents a gear pinion on shaft 28, and is preferably integral with said shaft. 33, 34, respectively represent additional journal bearings mounted in the sides of housing l, and 35 a shaft which is rotatably mounted in said bearings. 36, Fig. l, represents a set screw to maintain hearing 33 in adjusted position. A similar set screw is used to maintain hearing 34 in adjusted position. 37, Fig. 3, represents a cap in the aperture in one side of housing l, in which hearing 34 is mounted. 38 represents a gear wheel whichois rigidly mounted on shat 35, and is arranged to intermesh with gear pinion 32. 39 represents a sprocket wheel which is rigidly mounted on shaft 28, and 40 represents a sprocket wheel which is rigidly mounted on shaft 18 of motor 15. il represents a sprocket chain which connects sgroclet wheels 39 and 40. 42 represents a duet to conve'y eXcess oil from journal hearing 33 back into housing l.

The vertical adjustmeut of motor 15 which is provided by screws or bolts 13 and nuts 16, 17 is for means to take up any slack of chain 41 due to Wear.

The collar 19, and chamber or space 22 is to prevent oil from moving along on shaft 18 Out of housing 1, the chamber or space 22 being provided to receive any oil which may be thrown by centrifugal force from said shaft; from which chamber it will flow through duct 25 back into the housing.

I claim:

1. A housing for speed reducing mechanisin provided with abutments on one side thereof adjacent to its lower end, and reduc`- ing mechanism in said housing, in combination with a hollow base adapted to support an electric motor, a motor on said base, provided with a shaft projecting into the housing, and operative connections between said shaft and said reducing mechanism, said base provided with abutments at one end arranged to co-act with said first named abutments, means to hold said abutments rigidly together, and

means on said base to vertically adjust an eleotric motor and to maintain it in its adjusted position.

2. A housing for speed reducing mechanism provided with abutments on one side thereof adjacent to its lower end, speed reducing mechanism in said housing,in combination with a hollow base provided with abutments on one end arranged to co-act with said first named abutments, bolts and nu'ts arranged to hold said abutments rigidly together, and additional bolts and nuts ranged to adjustably support and continuously maintain an electric motor in adjusted position relative to said housing, said motor provided with a shaft projecting into said housing, said shaft and said speed reducing meehanisin, whereby adjusted relative positions are maintained.

3. A housing for speed reducing mechanism and a base for an electric motor, means to rigidly join said housing and said base, said 'housing provided with an aperture through one of the side walls thereof, in combination With a 'shaft rotatably j ournalled in said housing, a sprocket wheel rigidly secured on said sha'ft, a driven shai't rotatable by said motor arranged to extend through said aperture, a sprocket wheelrigidly secured on said driven shaft, a sprocket chain arranged to connect said sprocket wheels, and means on said base to vertically adjust and maintain in adjusted position the motor having said driven shaft, whereby said sprocket chain may be adjusted and maintained in suitable relation to said sprocket wheels.

4. A housing for speed redueing mecha-` nisni provided with an aperture on one side thereof, a cap also provided with an aperture therethrough registering with said first named aperture, a shaft. of an electric motor extending through said apcrtures, a collar on said shaft, said collar fitting loosely in said aperture in said cap, said cap having aspace therein, said shaft fitting loosely in said aperture in said cap, and a ductcommunicating with said space and with the interior of said housin n c OTTO CULLMAN.

and operative connections between 

